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Duramax First Generation: 2001-2004 (LB7) Discuss the first generation (2001-2004 LB7) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 09-14-2009, 11:41 PM   #1 (permalink)
ap_coach
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Fuel Filter Primer

Alright. I have found a replacement o-ring kit for the fuel filter primer. Anyone ever buy one of these?

Hydrapak Duramax Fuel Filter primer kit

https://ecommerce.hydrapakseals.com/...F-011D2BB51CBD
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Old 09-21-2009, 11:16 AM   #2 (permalink)
ap_coach
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Well I ordered one this morning. I'll let everyone know how it works.
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Old 09-21-2009, 01:47 PM   #3 (permalink)
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What kind of problems were you having?
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Old 09-21-2009, 04:55 PM   #4 (permalink)
ap_coach
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Couldn't prime the filter. Wasn't losing prime. Just when I put a new filter on I couldn't prime it. Had to pressurize the tank to get diesel to the engine.
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Old 09-21-2009, 06:42 PM   #5 (permalink)
first d-max
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yep let us know what you find and whats all in the kit if its all the o-rings or not.
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Old 09-21-2009, 08:29 PM   #6 (permalink)
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Quote:
Originally Posted by ap_coach View Post
Couldn't prime the filter. Wasn't losing prime. Just when I put a new filter on I couldn't prime it. Had to pressurize the tank to get diesel to the engine.
I've never been a fan of replace the filter and then use the hand pump to prime it. LOTS of people have difficulties when doing that. Air in the fuel system is bad. I just buy a gallon or so of new clean diesel and I fill the filter up before I put it on. I have an 04 and I don't know how much has changed. I access my filter by taking out the battery, not totally necessary but much easier, and i put the filter in through the wheel-well. I set the filter full of fuel on the frame and then reach down and get it from the top. Just screw it on and reconnect everything and go. Put the unused fuel in your tank. I buy fresh fuel every time.
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Old 09-24-2009, 04:37 PM   #7 (permalink)
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Quote:
Air in the fuel system is bad
But that's what the primer is for. To rid the air in the sytem and force it back to the tank...where it bubbles out and goes back to atmosphere. Except for microscopic entrained air...which neither a primer pump nor pre-filling will remove. When you hand prime it doesn't force air into the injectors. There has to be a bypass return or some way for the fuel to return to the tank, at the CP3. It cant just deadhead at the CP3.

Pre-filling is bad in my opinion. Real bad. Maybe not on an old Cat dozer or a IH 906...but on modern common rail engines, the clearances are just too critical for contamination to be tolerated.

Some Cummins engine manuals I have FORBID prefilling and absolutely say so in bold writing. One spec can wipe out an accumulator injection pump on a ISC8.3L for instance. And there is no such thing as buying "clean" fuel in a container and using that. Why should I think that fuel pump fuel be any cleaner that whats in my tank now? Its the same thing. The pump fuel is where ALL contamination comes from. We don't add contamination to our tanks....right?

If it doesn't go through my trucks filter, its not clean. But I understand prefilling. I done it on a 2005 Cat C7 once...because 2 hours of trying to prime yeilded a no start. It became an emergency condition. The primer was faulty.

Now if a person built a rigged up filtration setup where he/she could pour in a gallon and have it flow through a 2 micron filter...and empty into the Duramax filter...then thats different. And this could be done easily. But straight out the station tanks...thats just dirty .
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Last edited by neilltz; 09-24-2009 at 04:39 PM.
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Old 09-25-2009, 12:12 AM   #8 (permalink)
ap_coach
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well got the kit in the mail today...guess there is more work than I thought...i was expecting like 3 orings...theres gotta be like 10 of them in here......anyone got a diagram of the fuel primer filter housing thingy.
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Old 09-25-2009, 02:11 AM   #9 (permalink)
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i think there is a thread in the DIY section
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Old 09-25-2009, 03:13 AM   #10 (permalink)
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Does Anyone Know What The Thred Size Is On That Plastic Screw On The Top Of The Fuel Filter Housing ??
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